Question About "Follies" Lyrics/Lyrics Interpretation

I have been playing the most recent cast recording on a loop, and I have a question about a couple of the lyrics. I am hoping that someone here can shed some light.

During Ben's final song "Live, Laugh, Love," when the narrative thread starts to break down into chaos, Ben starts to shout some random thoughts like, "The job was there, I just took it. They never found out" and "She threatened to commit suicide. I never knew she was serious." What is he referring to? I don't see these words in any of the published lyrics, so is this an interpretive choice on the part of the actor? If so, what do they mean?

Gaveston is right. Ben is saying that no one ever found out he was a phony.

The suicide line refers to Sally.

For what it's worth, I never thought that Sally had Ben's kid.

It's an interesting thought, and I'm wracking my brain trying to figure out where it might be implied, but I don't think it's there. I think Ben left Sally for good just before the war broke out. Ben married Phyllis and went off to war, Sally attempted suicide and Buddy was there to help her pick up the pieces.